JT Aluminum Mid Arm Kit Artec IndustriesFor the past 5 years, we've been testing 7075 Aluminum links in the ARTECON to ensure that they could handle the abuse of both extreme, heavy duty rock crawling and normal daily driving. We've been pleased with how they've handled the rigorous abuse and how much weight is saved by using is compared to standard steel tubing. The JT Aluminum Mid Arm Kit starts with our 2. 0 inch outer diameter, aerospace grade 7075 Aluminum links front and rear. The